OSCache

OSCache
OSCache - 成长的路上

// -- Main.java --
import java.io.File;
import java.util.Iterator;

import com.opensymphony.oscache.base.NeedsRefreshException;
import com.opensymphony.oscache.general.GeneralCacheAdministrator;

public class Main {

  private static GeneralCacheAdministrator admin = new GeneralCacheAdministrator();

  public static void main(String[] args) {

    for (int i = 0; i < 2; i++) {
      Iterator files = org.apache.commons.io.FileUtils.iterateFiles(
          new File("."), new String[] {"java", "properties", "xml" }, false);
      while (files.hasNext()) {
        File file = (File) files.next();
        long st = System.currentTimeMillis();
        byte[] value = getFromFile(file);
        System.out.println("File name: " + file.getAbsolutePath()
            + " TimeMillis: " + (System.currentTimeMillis() - st)
            + " Size: " + value.length);
      }
    }

  }

  private static byte[] getFromFile(File file) {
    String key = file.getAbsolutePath();
    byte[] myValue;
    int myRefreshPeriod = 60; // How long the object can stay in cache in seconds.
    try {
      myValue = (byte[]) admin.getFromCache(key, myRefreshPeriod);
    } catch (NeedsRefreshException nre) {
      try {
        myValue = org.apache.commons.io.FileUtils.readFileToByteArray(file);
        admin.putInCache(key, myValue);
      } catch (Exception ex) {
        myValue = (byte[]) nre.getCacheContent();
        admin.cancelUpdate(key);
      }
    }
    return myValue;
  }
}
// -- output --
File name: C:\test\.\Main.java TimeMillis: 31 Size: 1456
File name: C:\test\.\oscache.properties TimeMillis: 16 Size: 5629
File name: C:\test\.\pom.xml TimeMillis: 15 Size: 910
File name: C:\test\.\Main.java TimeMillis: 0 Size: 1456
File name: C:\test\.\oscache.properties TimeMillis: 0 Size: 5629
File name: C:\test\.\pom.xml TimeMillis: 0 Size: 910